package com.heima.kafka.sample;

import org.apache.kafka.clients.consumer.*;
import org.apache.kafka.clients.producer.ProducerConfig;
import org.apache.kafka.common.TopicPartition;

import java.time.Duration;
import java.util.Collections;
import java.util.Map;
import java.util.Properties;
import java.util.regex.Pattern;

/** 消费者
 * @author ZQH
 * @version 1.0
 * @date 2023/8/24 21:43
 */
public class ConsumerQuickStart {
    public static void main(String[] args) {

        //kafka的配置信息
        Properties properties = new Properties();
        properties.put(ConsumerConfig.BOOTSTRAP_SERVERS_CONFIG,"192.168.253.100:9092");
        properties.put(ConsumerConfig.KEY_DESERIALIZER_CLASS_CONFIG,"org.apache.kafka.common.serialization.StringDeserializer");
        properties.put(ConsumerConfig.VALUE_DESERIALIZER_CLASS_CONFIG,"org.apache.kafka.common.serialization.StringDeserializer");
            //设置消费者组
        properties.put(ConsumerConfig.GROUP_ID_CONFIG,"group2");

        //手动提交偏移量
        properties.put(ConsumerConfig.ENABLE_AUTO_COMMIT_CONFIG,"false");

        //创建消息对象
        KafkaConsumer<String,String> consumer =new KafkaConsumer<String, String>(properties);


        //订阅主题
        consumer.subscribe(Collections.singletonList("topic-first"));


        //拉取消息

        //同步提交和异步提交偏移量
        try {
            while (true) {
                ConsumerRecords<String, String> consumerRecords = consumer.poll(Duration.ofMillis(1000));
                for (ConsumerRecord<String, String> consumerRecord : consumerRecords) {
                    System.out.println(consumerRecord.key());
                    System.out.println(consumerRecord.value());
                    System.out.println(consumerRecord.offset());
                    System.out.println(consumerRecord.partition());
                }
                //异步提交偏移量
                consumer.commitAsync();
            }
        }catch (Exception e){
            e.printStackTrace();
            System.out.println("记录错误的信息:"+e);
        }finally {
            //同步提交
            consumer.commitSync();
        }


        //一直处于监听状态
//        while (true){
//            ConsumerRecords<String, String> consumerRecords = consumer.poll(Duration.ofMillis(1000));
//            for (ConsumerRecord<String, String> consumerRecord : consumerRecords) {
//                System.out.println(consumerRecord.key());
//                System.out.println(consumerRecord.value());
//                System.out.println(consumerRecord.offset());
//                System.out.println(consumerRecord.partition());
//
////                try {
////                    //同步提交偏移量
////                    consumer.commitSync();
////                }catch (CommitFailedException e){
////                    System.out.println("记录提交失败的异常："+e);
////                }
//
//            }
//
//            //异步的方式提交偏移量
//            consumer.commitAsync(new OffsetCommitCallback() {
//                @Override
//                public void onComplete(Map<TopicPartition, OffsetAndMetadata> map, Exception e) {
//                    if (e!=null){
//                        System.out.println("记录错误的提交偏移量："+map+"，异常信息为"+e);
//                    }
//                }
//            });
//        }



    }
}
